1-1 Variables and Expressions – Day 2
Algebra 1
Vocabulary:
evaluate –
Examples:
3) Evaluate each expression for a = 4, b = 7, and c = 2.
A) b – c
B) bc
Check It Out!
3) Evaluate each expression for m = 3, n = 2, and p = 9.
a) mn
b) p – n
c) p  m
Examples:
4A) Approximately eighty-five 20-ounce plastic bottles must be recycled to produce the fiberfill for a sleeping bag. Write
an expression for the number of bottles needed to make s sleeping bags.
4B) Find the number of bottles needed to make 20, 50, and 325 sleeping bags.
Writing Math: A replacement set is a set of numbers that can be substituted for a variable. The replacement set in
Example 4 is (20, 50, and 325).
Check It Out!
4a) To make on sweater, 63 twenty ounce plastic drink bottles must be recycled. Write an expression for the number of
bottles needed to make s sweaters.
4b) Find the number of bottles need to make 15, 25, and 50 sweaters.